Month: November 2022

Nuna, Nobumitsu published the artcileDetection of tetramethylthiuram disulfide and related compounds using the chemiluminescence of tris (2,2′-bipyridyl) ruthenium (III) cation, Related Products of catalysis-chemistry, the publication is Bunseki Kagaku (2003), 52(9), 763-767, database is CAplus.

The chemiluminescence (CL) of tris(2,2′-bipyridyl)ruthenium(III) cation was applied to the determination of tetramethylthiuram disulfide (TMTD). A sample was injected to an HPLC system with Chromolith Performance RP-18e. The eluted sample and CL reagent were mixed, and sent to a CL-detector. The detection limit of TMTD using the HPLC system was 0.15 pmol (S/N= 3). The calibration curve was linear over the injection amount range from 0.6 to 20 pmol. To improve the sensitivity of the CL method, the water that generated the background was removed from the system. As a result, the sensitivity was improved.

Bunseki Kagaku published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Lutskii, A. E. published the artcileDipole moments of some substituted diphenylamines, Name: Bis(4-nitrophenyl)amine, the publication is Zhurnal Obshchei Khimii (1963), 33(3), 985-7, database is CAplus.

The following values of dipole moments (in D.) were determined from dielec. constants of solutions in C₆H₆ at 25¡ã (p,p’-dihydroxy and the nitro derivatives were examined in dioxane) in a group of substituted Ph₂NH [substituents and dipole moments (D.) shown]: 3-HO, 1.98; 4-HO, 1.95; 3-MeO, 1.70; 4-MeO, 1.79; 2,2′-(HO)₂, 3.69; 4,4′-(HO)₂, 3.50; 4,4′-HO(MeO), 2.32; 4,4′-(MeO)₂, 2.06; N,4- Ph(MeO), 2.09; N,4,4′- Ph(MeO)₂, 2.49; N,4- Ac(AcO), 4.14; N,4,4′-Ac(AcO)₂, 4.50; 2,2′-(NO₂)₂, 6.28; 4,4′(NO₂)₂, 5.13; 2,2′, 4,4′-(NO₂)₂Me(MeO), 6.47; 2,2′,4,4′-(NO₂)₂Me(MeO), 6.79. The aryl group introduced at the N atom of PhNH₂ tended to disperse the effects of conjugation of the NH₂ group among the aromatic nuclei. Diphenylamines with groups m both Ph rings showed the competing effect of these rings with the unshared electron pair of the central N atom, manifested by a neg. moment of group interaction as estimated from the dipole moments.

Zhurnal Obshchei Khimii published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Name: Bis(4-nitrophenyl)amine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Sarigueney, Ahmet Burak published the artcileSynthesis and Antimicrobial Activity of Some 2-aminothiazole and 2-aminothiadiazine Derivatives, Synthetic Route of 6972-05-0, the publication is Journal of Heterocyclic Chemistry (2018), 55(9), 2107-2110, database is CAplus.

A series of thiazoles I [R¹ = NH₂, NHMe, NMe₂, NHPh], bis-thiazole II [R¹ = NH₂], thiadiazines III and bis-thiadiazine IV [R¹ = NH₂] was synthesized from reaction of phenoxy chloroacetophenone with thioureas and thiosemicarbazides resp. The synthesized compounds I, II, III and IV were characterized by spectroscopic techniques and evaluated as potential antimicrobial agents. The synthesized compounds were evaluated for thier antibacterial activity by broth microdilution method and expressed as min. inhibitory concentration; against Escherichia coli, Salmonella typhimurium, Bacillus cereus, and Staphylococcus aureus. Results showed that compounds, I [R¹ = NHMe], II [R¹ = NH₂] and IV [R¹ = NH₂] were found to selectively inhibit Gram positives.

Journal of Heterocyclic Chemistry published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C3H8N2S, Synthetic Route of 6972-05-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Miyamura, Hiroyuki published the artcileReaction Rate Acceleration of Cooperative Catalytic Systems: Metal Nanoparticles and Lewis Acids in Arene Hydrogenation, Product Details of C8H8O2, the publication is Angewandte Chemie, International Edition, database is CAplus and MEDLINE.

Employing two distinct catalysts in one reaction medium synergistically is a powerful strategy for activating less reactive substrates. Although the approach has been well-developed in homogeneous conditions, it remains challenging and rare in heterogeneous catalysis, especially under gas-liquid-solid multiphase reaction conditions. Here, authors describe the development of cooperative and synergistic catalyst systems of heterogeneous Rh-Pt bimetallic nanoparticle catalysts, Rh-Pt/DMPSi-Al₂O₃, and Sc(OTf)₃ in the liquid phase for the hydrogenation of arenes under very mild conditions. Dramatic rate acceleration was achieved with cooperative activation. Remarkably, more challenging substrates that contained strong electron-donating groups and sterically hindered substituents were smoothly hydrogenated. Mechanistic insights into the cooperative activation of an aromatic substrate by heterogeneous metal nanoparticles and a soluble Lewis acid was obtained by kinetic studies and by direct observation of ¹H and ⁴⁵Sc NMR spectra.

Angewandte Chemie, International Edition published new progress about 118-90-1. 118-90-1 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Natural product, name is 2-Methylbenzoic acid, and the molecular formula is C8H8O2, Product Details of C8H8O2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Lelikova, V. E. published the artcileDonor-acceptor properties of organosilicon compounds. III. Binary systems of aprotic solvents with some alkyl(aryl)fluoro-, methylphenyldichloro-, tetraethoxy-, and trimethylphenylsilanes, SDS of cas: 312-40-3, the publication is Zhurnal Obshchei Khimii (1973), 43(6), 1300-4, database is CAplus.

The property-composition curves for the binary systems of solvents, e.g., OP(NMe2)3, Me2NAc, Me2SO, MeNO2, PhNO2, PhF, AcPh, and pyridine, with MeSiPhCl2, Si(OEt)4, Me3SiPh, Ph2SiF2, PhSiF3, Et3SiF, and MeSiPhF2 were determined The plots of variation of nd and d. showed that interaction took place only in cases in which a SiF bond existed, or in which MeSiPhCl2 was a component. The acceptor ability of fluorosilanes decreased in the order: PhSiF3, Ph2SiF2, MeSiPhF2, Et3SiF. MeSiPhCl2 was superior to its difluoro analog with respect to donor-acceptor reactions.

Zhurnal Obshchei Khimii published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, SDS of cas: 312-40-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ociepa, Michal published the artcileMild and Chemoselective Phosphorylation of Alcohols Using a ¦·-Reagent, SDS of cas: 71989-31-6, the publication is Organic Letters (2021), 23(24), 9337-9342, database is CAplus and MEDLINE.

An operationally simple, scalable, and chemoselective method for the direct phosphorylation of alcs. using a P(V)-approach based on the ¦·-reagent platform is disclosed. The method features a broad substrate scope of utility in both simple and complex settings and provides access to valuable phosphorylated alcs. that would be otherwise difficult to obtain.

Organic Letters published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, SDS of cas: 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Lupp, Amelie published the artcileIn vitro investigations on the interactions of different fomocaine metabolites with rat microsomal cytochrome P450, HPLC of Formula: 31719-76-3, the publication is Nova Acta Leopoldina (2003), 87(329), 253-264, database is CAplus.

Fomocaine is an ether-type local anesthetic used in dermatol. practice for surface anesthesia. In view of possible new (systemic) applications, e.g. in the therapy of migraine or as an antiarrhythmic, knowledge of interactions also of its metabolites with the cytochrome P 450 system and thus with the metabolism of endogenous or other foreign substances is of importance. Thus, in the present study effects of thirteen fomocaine metabolites on liver P 450 mediated monooxygenase functions were assessed by measuring the influence on the model reactions ethoxyresorufin O-deethylation, ethoxycoumarin O-deethylation, pentoxyresorufin O-depentylation and ethylmorphine N-demethylation. Possible (potentially beneficial) antioxidative capacities of the compounds were evaluated by the influence on luminol and lucigenin amplified chemiluminescence, H₂O₂ production, and stimulated lipid peroxidation in rat liver microsomes and on rat whole blood chemiluminescence. Fomocaine inhibited all four model reactions for P 450 mediated monooxygenase functions in micromolar concentrations In general, the effects of the metabolites were much less pronounced than those of fomocaine. Only 2-hydroxyfomocaine yielded similar effects as fomocaine. A noticeable inhibition of the model reactions was also seen with 4-hydroxyfomocaine. This effect was, however, already distinctly less than that of fomocaine. The overall antioxidative capacity of fomocaine was not very pronounced. Many of the metabolites, especially those containing a phenolic group, displayed a stronger antioxidative capacity than fomocaine. Again, effects were most pronounced with 2-hydroxy- and 4-hydroxyfomocaine. Considering all effects of the metabolites tested, it is to be expected that after systemic application biotransformation of fomocaine to these metabolites will lead to a decrease in the overall interactions with the P 450 system and to an increase in the antioxidative capacity on the whole.

Nova Acta Leopoldina published new progress about 31719-76-3. 31719-76-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 4-(Phenoxymethyl)benzoic acid, and the molecular formula is C14H12O3, HPLC of Formula: 31719-76-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Shurukhin, Yu. V. published the artcileThermal reactions of 1-aryl-5-methyltetrazoles, Category: catalysis-chemistry, the publication is Khimiya Geterotsiklicheskikh Soedinenii (1984), 1422-7, database is CAplus.

Thermolysis of the title compounds I (R = Me, NO₂, NH₂) at 20-800¡ã leads via isomerization to azides and elimination of N₂ to give singlet nitrenes with subsequent rearrangement to benzimidazoles and carbodiimides. Electronic effects of p-substituents in the benzene ring influenced the thermolysis mechanism. Approx. 30 products were confirmed.

Khimiya Geterotsiklicheskikh Soedinenii published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C3H9ClOS, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Frohn, H. J. published the artcileReactions of pentafluorophenylxenon(II) hexafluoroarsenate [C₆F₅Xe]⁺[AsF₆]^– with aromatic compounds, Name: Trimethyl(perfluorophenyl)silane, the publication is Journal of Fluorine Chemistry (1993), 64(3), 201-15, database is CAplus.

Pentafluorophenylxenon(II) hexafluoroarsenate, [C₆F₅Xe]⁺[AsF₆]^–, reacts (MeCN, 20¡ã) with aromatic compounds C₆H₅X (X = Me, F, CF₃, NO₂ and CN), yielding isomeric mixtures of polyfluorinated biphenyls XC₆H₄C₆F₅. When X = I, iodopentafluorobenzene is also formed, whereas trimethylsilylbenzene (X = SiMe₃) is only converted to C₆H₅C₆F₅ and C₆F₅H. These results are compared with the data for radical pentafluorophenylation and for fluorination reactions of the corresponding aromatic compounds with XeF₂. Polyfluoroarom. compounds C₆F₆, C₆F₅H, C₆F₅I, C₆F₅CN and C₆F₅SiMe₃ do not react with [C₆F₅Xe]⁺[AsF₆]^– under the same conditions.

Journal of Fluorine Chemistry published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, Name: Trimethyl(perfluorophenyl)silane.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Gronowitz, Salo published the artcileOn the syntheses of triacylglycerols from branched saturated fatty acids, Category: catalysis-chemistry, the publication is Lipids (1997), 32(6), 667-673, database is CAplus and MEDLINE.

A number of triacylglycerols with branched acyl groups were prepared via 1,2-isopropylidene glycerol for the purpose of studying three different phys. properties: gel point, refractive index, and d. The monoacid triacylglycerols were prepared either via the corresponding acids or the acyl chlorides.

Lipids published new progress about 3115-28-4. 3115-28-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is 2-Butylhexanoic acid, and the molecular formula is C10H20O2, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia